Improvement in the manufacture of artificial stone



D. n. PRINDLE. Manufacture nfAr'ti-n'c-ial stone.

Patented May 12,1874'.

iw", A. a

UNITED' STATE-s PATENT OFFICE.

DANIELv a. rrunnnn,or` nAsr nnT-HANY, New YORK.

IMPRovEMENT IN THEMNUFAQTURE oF ARTIFICIAL sToNE.

Speocaton'fcrming partei Letters Patent No. 150,710, datedMay 12, 1874; application fIled April 20,1872.

. as herein described, and producing a durable and practical face for its use, combined with a' cheap and easily constructed back or lling.

In the drawings the figure represents a perspective view of my improvement.

These tiles, bricks, or slabs are formed in molds in the ,manner following, which molds may be of any desired size, shape, or construction: I prepare the material in two or more grades or qualities, Vone grade being hard or fine to produce the outer or finished and durable surface exposed to wear, while the vother or others are coarse and cheap in their nature to form the foundation or bedeach vgrade to be kept ready for molding by two or more men. It is the object to so oombine the materials in the process of making that the separation of the diiferent layings shall be impracticable, the several qualities blending or uniting, so that a gradual building up is made, that shall insure the proper hardness, strength, and texture throughout, and adapt the two opposite sides to the uses and conditions to which they are subject.

Y The niold being prepared, the ne, durable,

or best quality is then applied iirst, and the mold`partially filled-say, one-half inch or overand the contents leveled off and pressed down. Thesecond quality -is then applied in the same manner on top thev other, and the succeeding ones following, (if more than two are used.) The whole is then properly pressed in the mold, when it is left to set a few minutes, and removed in a finished state.

I design these` articles for the various uses to which tiles, bricks, and similar blocks are applied-such as hog-pen oors, cellar-bottoms, pavements, building blocks, &c. For

hogpen floors and analogous uses, where slipping of animals is to be obviated or drainage secured, I prefer to form grooves in the vupper or wearing surface. These grooves may be arranged as desired, but preferably checkwise, as shown in the drawing. In order Vto produce these the floor or bottom of the mold must be provided with corresponding ribs.

These articles, made in the manner above described, present the same hardened, fIne, and nished exterior surface that is ordi= narily produced from a single fine and costly grade of material, while the ground work or foundation is made of any cheap, coarse mauses, to prevent slipping of the animals, now.

so common. In this form the oor can be easily cleaned, as a shovel or hoe will easily pass over the surface, which would not be the case if projecting ribs were formed. There is also less liability of breakage or wear. Such a floor is very durable, and may be made water-proof by filling the joints with cement in laying.

For such a use as this, the articles, with the grooves or indent-ations in the surface, and made up of different grades and of any convenient material, constitute a new article of manufacture never before known, so far as I am aware.

In laying of pavements or walks,the grooves may be made effective in draining oft' water by simply laying the tiles or slabs so that the grooves come inline. This would be useful in street-walks, where it is desirable to avoid standing water. I

, These blocks may be made of any desired color by the admixtureof the proper coloring ingredients. This may be desirable in is recessed or grooved in the manner substanbuilding, thus giving beauty and ornament, tally as shown and speoied.

ins Well as durability, to the outern or front; In Witness whereof I have hereunto sighed layer only. my 11eme in the presence of two subscribing What I claim, und desire to secure by Iet- Witnesses.

ters Patent, is-

Au artificial block, such as described, D R" PRINDLE' formed by molding ytogether concrete or ce- Witnesses: ment of different grades, as set forth, the R. F. OSGOOD, uer grade forming the uished fzrce,.which ARCHIE BAINE. 

